quadrics

void ellipsoid() {
	int i = 0;
	for (double u = -PI; i < 200; u += PI/100, i++) {
		int j = 0;
		for (double v = -PI/2; j < 100; v += PI/100, j++) {
			double x = a*cos(v)*cos(u);		oby[i][j].setX(x);
			double y = b*cos(v)*sin(u);		oby[i][j].setY(y);
			double z = c*sin(v);			oby[i][j].setZ(z);
		}
	}
}

void hyperboloid() {
	int i = 0;
	for (double u = -PI; i < 200; u += PI/100, i++) {
		int j = 0;
		for (double v = -PI/2; j < 100; v += PI/100, j++) {
			double x = a*cos(u)/cos(v);		oby[i][j].setX(x);
			double y = b*sin(u)/cos(v);		oby[i][j].setY(y);
			double z = c*tan(v);			oby[i][j].setZ(z);
		}
	}
}

void hyperboloid2Sisi() {
	int i = 0;
	for (double u = -PI/2; i < 100; u += PI/100, i++) {
		int j = 0;
		for (double v = -PI/2; j < 100; v += PI/100, j++) {
			double x = a*tan(v)*cos(u);		oby[i][j].setX(x);
			double y = b*tan(v)*sin(u);		oby[i][j].setY(y);
			double z = c/cos(v);			oby[i][j].setZ(z);
		}
	}
	i = 100;
	for (double u = PI/2; i < 200; u += PI/100, i++) {
		int j = 0;
		for (double v = -PI/2; j < 100; v += PI/100, j++) {
			double x = a*tan(v)*cos(u);		oby[i][j].setX(x);
			double y = b*tan(v)*sin(u);		oby[i][j].setY(y);
			double z = -c/cos(v);			oby[i][j].setZ(z);
		}
	}
}

void ellipticCone() {
	int i = 0;
	for (double u = -PI; i < 200; u += PI/100, i++) {
		int j = 0;
		for (double v = -PI/2; j < 100; v += PI/100, j++) {
			double x = a*v*cos(u);		oby[i][j].setX(x);
			double y = b*v*sin(u);		oby[i][j].setY(y);
			double z = c*v;				oby[i][j].setZ(z);
		}
	}
}

void ellipticParaboloid() {
	int i = 0;
	for (double u = -PI; i < 200; u += PI/100, i++) {
		int j = 0;
		for (double v = 0; j < 100; v++, j++) {
			double x = a*v*cos(u);		oby[i][j].setX(x);
			double y = b*v*sin(u);		oby[i][j].setY(y);
			double z = v*v;				oby[i][j].setZ(z);
		}
	}
}

void hyperboloidParaboloid() {
	int i = 0;
	for (double u = -PI; i < 200; u += PI/100, i++) {
		int j = 0;
		for (double v = 0; j < 100; v++, j++) {
			double x = a*v*tan(u);		oby[i][j].setX(x);
			double y = b*v/cos(u);		oby[i][j].setY(y);
			double z = v*v;				oby[i][j].setZ(z);
		}
	}
}

void quadric() {
	// ellipticParaboloid();
	hyperboloidParaboloid();
}